Poly(vinyl alcohol) hydrogels. Formation by electron beam irradiation of aqueous solutions and subsequent crystallization

摘要: Aqueous solutions of poly(vinyl alcohol) were submitted to varying doses electron beam irradiation. By modification the classical Flory-Huggins equations appropriate initial state solution polymer, molecular weight between crosslinks, Mc, was calculated as a function radiation dose, polymer concentration, and temperature. Following crosslinking in state, crystallization induced by dehydrating network at temperatures above 90°C. dehydration, reequilibrated with water its tensile properties compared identically prepared hydrogels not subjected dehydration. Greatly enhanced values ultimate strength resistance tear result from treatment producing crystallization, those crosslinked but previously dehydrated gels.